Comma at the End of a List Following a Colon

Solution 1:

The list of colors is a parenthesis and should have the same punctuation at both ends, beginning with a comma instead of a colon.

Bob's three favorite colors, black, red, and blue, are Emma's least favorite colors.

However, while technically correct, this is not a good stylistic choice. The commas in the parenthesis itself make the use of additional commas awkward, so it is preferred to offset the parenthesis with a different punctuation sign like parentheses (self-demonstrating here) or dashes.

This doesn't look like a formal text, so there is no much preference over one or the other, bear in mind that parentheses are not preferred for formal text as they can make said text look messy